SIGFIGS
DENSITY
FORMULAS
AMI
100
What is 7 cm x 7 cm?
50 cm2
100
An object takes up 10. mL of space and has a mass of 8.0 g. What is the object's density?
D = m / V = 8.0 g / 10. mL = 0.80 g/mL
100
What's the chemical formula for bromine?
Br2
100
What is phosphorus made of (A, M, or I)?
P4 is made of MOLECULES.
200
What's 7 cm + 7 cm?
14 cm OR 14. cm
200
What will happen if an object with a mass of 22 g and a volume of 33 mL is added to water?
It will float since it's density (0.67 g/mL) is less than that of the density of water (1.00 g/mL).
200
What's the chemical formula for tricarbon tetrahydride?
C3H4
200
What's sodium phosphate, Na3PO4, made of? (A, M or I)
Na3PO4 is made of IONS.
300
What's 8.32 m2 / 0.78 m?
11 m OR 11. m
300
Mercury has a density of 13.1 g/mL. What is the mass (in grams) of 38.0 mL of mercury?
m = D x V = 13.1 g/mL x 38.0 mL = 498 g
300
What's the chemical formula for tin(IV) sulfate?
Sn(SO4)2
300
What's tricarbon tetrahydride made of? (A, M or I)
C3H4 is made of MOLECULES.
400
What's 7.00 m x 8.0 m x 2 m ?
100 m3
400
How can we determine the volume of an irregularly shaped object?
Add it to water (assuming that it's not water soluble). The difference in water levels is the volume of the object.
400
What's the chemical formula for lead(IV) sulfide?
Pb2S4 = PbS2
400
A beaker is labeled with NaCl(aq). What types of particles are in that beaker?
Sodium IONS, chloride IONS and water MOLECULES are in that beaker.
500
What's (7.0 g + 8.0 g) / (32.0 mL - 16.0 mL) ?
0.938 g/mL
500
What is the density of a substance with a mass of 24.6 g that is submerged in 11.2 mL of water? When added to water, the volume level rises to 18.6 mL.
Volume of object = 18.6 mL - 11.2 mL = 7.4 mL Density = mass / volume = 24.6 g / 7.4 mL = 3.3 g/mL
500
What is the formula of sodium oxalate? How many ions are in 1 formula unit of it?
Na2C2O4 has 3 ions per formula unit. Na2(C2O4) = 2 ions of Na+ and 1 ion of oxalate (C2O4)2-.
500
Solutions of sodium chloride and silver nitrate are mixed together. A precipitate forms. 1) What is the formula of the precipitate? 2) What are the names of the spectator ions?
1) AgCl is the formula of the precipitate. 2) Sodium ions and nitrate ions are the spectator ions.
M
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